WO2018061914A1

WO2018061914A1 - Shift device for transmission

Info

Publication number: WO2018061914A1
Application number: PCT/JP2017/033845
Authority: WO
Inventors: 拓紀赤塚; 良介二宮; 市川　雅也; 英也大澤
Original assignee: アイシン・エーアイ株式会社
Priority date: 2016-09-29
Filing date: 2017-09-20
Publication date: 2018-04-05
Also published as: JPWO2018061914A1; EP3521666A4; CN110023654A; US20210285541A1; EP3521666A1

Abstract

This shift device is provided with a detent device, which is provided with an engaging member that is provided between a housing and a shift fork and that engages in a recessed part of the shift fork, and an elastic member that pushes the engaging member toward the recessed part of the shift fork, the engaging member being pushed into the recessed part of the shift form by the urging force of the elastic member and the shift fork being held in a neutral position when a hub and a transmission gear are in an unengaged neutral position, and the engaging member being pushed into an inclined surface of the shift fork by the urging force of the elastic member and the shift fork being urged into an engaged position when the hub is in an engaged position of being engaged with the transmission gear.

Description

Transmission shift device

The present invention relates to a transmission shift device.

Patent Document 1 discloses a shift fork rotatably supported on a housing of a transmission by a rotation center axis. A shift device for a transmission is shown, in which a shift fork moves from a neutral position to an engaged position by pivoting about a pivot center axis to shift the hub in the longitudinal direction of the transmission shaft of the transmission. .

JP, 2016-65589, A

However, in the transmission shift device of Patent Document 1 mentioned above, since the shift fork is swingable around the rotation center axis, the shift fork has a neutral position and engagement due to, for example, vibration during traveling. It is desirable to keep it out of position.

An object of the present invention is to provide a transmission shift device capable of stably maintaining a neutral position and an engagement position of a shift fork pivoting about a pivot center axis.

A transmission shift device according to the present invention includes a power transmission shaft, a housing accommodating a transmission having the power transmission shaft, and a shift shaft movable along the longitudinal direction of the power transmission shaft according to a shift operation. A hub which is integrally rotated with the power transmission shaft and is shifted along the longitudinal direction of the power transmission shaft, and which is rotatably engageable with a transmission gear provided on the power transmission shaft, and the power transmission shaft A rotation center axis disposed in the housing on an axis extending in a direction perpendicular to the axis of the housing, a connecting portion provided at the tip end portion, a recess, and an opening portion of the recess and the rotation center axis And an inclined surface which is inclined with respect to the rotation shaft, the rotation shaft being rotatably supported by the rotation center shaft, and being engageable with the shift shaft to move the shift shaft A shift fork that swings about the pivot center axis according to the displacement of the shaft and shifts the hub in the longitudinal direction of the power transmission shaft via the connection portion; and the housing and the shift fork And an elastic member for pressing the engaging member toward the recess of the shift fork, the hub and the transmission gear being provided between the hub and the transmission gear. In the non-engaging neutral position, the engaging member is pressed against the recess of the shift fork by the biasing force of the elastic member, the shift fork is held in the neutral position, and the hub engages with the transmission gear In the engagement position, the engagement member is pressed against the inclined surface of the shift fork by the biasing force of the elastic member to attach the shift fork to the engagement position. Comprising a detent device for the.

According to this, in the detent device, it is possible to stably maintain the neutral position and the engagement position of the shift fork that swings around the rotation center axis. Therefore, it is possible to prevent the neutral position and the engagement position of the shift fork from deviating from the neutral position and the engagement position due to, for example, vibration during traveling.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic diagram which showed notionally the shift device for transmissions in one Embodiment of this invention. It is a schematic diagram which shows shift operation of the shift device for transmissions shown in FIG. It is an explanatory view showing the concrete composition which rocks the shift fork in the shift device for transmissions in one embodiment of the present invention. It is an enlarged view of the A section of FIG. It is a partial top view which shows one Example of the detent apparatus of the shift device for transmissions in one Embodiment of this invention. It is a partial top view which shows the effect | action of the detent apparatus shown in FIG. FIG. 7 is a partial plan view showing the operation of the detent device when the shift fork swings in the opposite direction to that shown in FIG. 6A. It is a partial top view which shows the other Example of the detent apparatus of the shift device for transmissions in one Embodiment of this invention. It is a partial top view which shows the effect | action of the detent apparatus shown in FIG. FIG. 9 is a partial plan view showing the operation of the detent device when the shift fork swings in the opposite direction to that shown in FIG. 8A.

An embodiment of the present invention will be described below with reference to the drawings.

The configuration and operation of the transmission shift device 10 will be outlined with reference to FIGS. 1 and 2. In the transmission shift device 10, the shift fork 11 is operated by a shift operation for selecting a target transmission gear by a shift lever (not shown). In response to the shift operation, shift shaft 13 is displaced along the longitudinal direction of power transmission shaft 12 of transmission 1 (shown in FIG. 3). The transmission shift device 10 is provided in the transmission 1.

The hub 14 rotates integrally with the power transmission shaft 12 and is shifted along the longitudinal direction of the power transmission shaft 12, and the transmission gear 15 of the transmission gear 15 or transmission gear 16 is loosely fitted on the power transmission shaft 12. And can be engaged in the rotational direction. The hub 14 shifted along the longitudinal direction of the power transmission shaft 12 meshes with the target transmission gear and rotates in synchronization with the rotation of the transmission gear.

The

transmission gears

15 and 16 are gears loosely fitted to the power transmission shaft 12. Since the hub 14 is provided so as to rotate integrally with the power transmission shaft 12, the rotation of the

transmission gears

15 and 16 is motive power through the hub 14. It is transmitted to the transmission shaft 12.

The shift fork 11 engageable with the shift shaft 13 shifts the hub 14 in the longitudinal direction of the power transmission shaft 12 at the longitudinal displacement of the power transmission shaft 12 in the shift shaft 13. In order to shift the hub 14 in the longitudinal direction of the power transmission shaft 12 with less force, the shift fork 11 is mounted on the housing 17 (shown in FIG. 3) on an axis extending in a direction perpendicular to the axis of the power transmission shaft 12. It is rotatably supported by the rotation center shaft 18 disposed. The housing 17 accommodates the transmission 1 having the power transmission shaft 12.

As a result, as shown by the arrows in FIG. 2, the shift fork 11 swings around the rotation center axis 18 by displacement of the power transmission shaft 12 in the longitudinal direction, and a connecting portion provided at the tip of the shift fork 11 19 slides the hub 14 in the longitudinal direction of the power transmission shaft 12 through the sliding with the groove 20 provided on the outer periphery of the hub 14.

As shown in FIG. 1, as the shift fork 11 is moved from the neutral position where the hub 14 and the

transmission gears

15 and 16 are not engaged, as shown in FIG. The state to the engagement position engaged with the transmission gear, for example, the transmission gear 15 shows an example of the shift operation of the transmission 1.

The shift fork 11 swinging around the rotation center shaft 18 uses the engagement portion 21 with the shift shaft 13 as a force point, the connection portion 19 as an action point, and the rotation center shaft 18 as a fulcrum. Use it to rock and shift the hub 14. Therefore, the hub 14 can be shifted in the longitudinal direction of the power transmission shaft 12 with less force.

The shifted hub 14 meshes with the meshing gear 22 provided on the side surface and the meshing gear 23 of the transmission gear 15. By meshing, the transmission gear 15 can transmit the power transmitted to the transmission gear 15 to the power transmission shaft 12 via the hub 14.

Similarly, shift fork 11 can be engaged with transmission gear 16, which is a target transmission gear, by the swinging of the shift fork 11 shown in FIG. 2 in the direction opposite to the swinging direction of shift fork 11. It is free. The meshing between the hub 14 and the transmission gear 16 is performed by meshing the meshing gear 24 provided on the side surface of the hub 14 with the meshing gear 25 of the transmission gear 16.

Next, an embodiment of the detent device according to the present invention will be described based on FIGS. 3 to 5 and FIGS. 6A and 6B. FIG. 3 shows a specific configuration in which the aforementioned shift fork 11 swings around the rotation center axis 18. A detent device 30 for stably maintaining the neutral position and the engagement position of the shift fork 11 described above is provided between the housing 17 and the shift fork 11 as shown in FIG.

As shown in FIG. 3, the shift fork 11 is formed in a substantially C-shape, and both ends of the shift fork 11 are provided on the housing 17 and rotatably supported by a rotation center shaft 18 to be a rotation center shaft. Swing around 18 The rotation center shaft 18 is disposed in the housing 17 on an axis extending in a direction perpendicular to the axis of the power transmission shaft 12.

In the example shown in FIG. 3, the rotation center shaft 18 is configured by two

rotation center shafts

18a and 18b arranged on the same axis. The number of rotation center shafts 18 is not limited to two, and it is apparent that the rotation center shaft 18 a and the rotation center shaft 18 b can be integrated to be one.

As shown in FIGS. 3 to 5, the detent device 30 is movable in the longitudinal direction of the cylindrical member 31 so that the longitudinal cylindrical member 31 extends in the axial direction of the rotation center shaft 18 and the cylindrical member 31. And a detent ball 32 (corresponding to an engagement member) to be held. The cylindrical member 31 is mounted on one side in a mounting hole 33 provided in the housing 17, and the other side faces the shift fork 11 inside the housing 17.

As shown in FIGS. 3 and 4, the detent ball 32 is moved to the shift fork 11 by the biasing force acting in the axial direction of the rotation center shaft 18 by an elastic member 34 such as a spring provided inside the cylindrical member 31. It is pressed. That is, the detent device 30 is disposed such that the biasing force of the elastic member 34 acts in the axial direction of the rotation center shaft 18. The detent ball 32 has a radius of curvature y and a diameter 2y, as shown in FIG.

The shift fork 11 has a pressure receiving portion 35 facing the detent ball 32 and receiving the pressure of the detent ball 32. In the configuration shown in FIG. 3, the pressure receiving portion 35 is located between the above-mentioned point of force and the fulcrum in the swing fork 11.

As shown in FIG. 5, the pressure receiving portion 35 is connected to the recess 36 and the opening portion of the recess 36 and is inclined with respect to the rotation center axis 18, specifically, the first inclined surface 37 and the second And an inclined surface 38. The first inclined surface 37 and the second inclined surface 38 are provided along both sides in the swing direction (vertical direction in FIG. 5) of the shift fork 11 of the recess 36 of the shift fork 11.

In the neutral position where the hub 14 and the transmission gears 15 and 16 described above are not engaged, the shift fork 11 is in the position shown in FIG. 5 and the detent ball 32 engages with the recess 36 to provide an elastic member. It is pressed by the biasing force of 34. Thereby, the shift fork 11 is stably held in the neutral position.

When the shift fork 11 swings from the neutral position shown in FIG. 5 to an engagement position, for example, a first engagement position where the hub 14 and the transmission gear 15 engage, the detent ball 32 sways the shift fork 11. With the movement, the recess 36 is disengaged from the engagement of the recess 36 against the pressure by the elastic member 34, and is moved to the inclined surface, for example, the first inclined surface 37, as shown in FIG. 6A. The detent ball 32 moved to the first inclined surface 37 is pressed against the first inclined surface 37 by the biasing force of the elastic member 34. Thereby, the shift fork 11 is stably held in the first engagement position.

As shown in FIG. 6A, the first inclined surface 37 is provided so that the facing distance L1 between the tip surface 31b of the cylindrical member 31 and the first inclined surface 37 becomes narrower as it approaches the opening of the recess 36. The first inclined surface 37 has a first surface 37a connected to the opening of the recess 36 and a second surface 37b connected to the first surface 37a, and the second surface 37b is opposed to the first surface 37a. It is formed on a steep slope where the change rate of the distance L1 is large. As shown in FIG. 6A, in the first engagement position where the hub 14 and the transmission gear 15 engage with each other, the detent ball 32 is attached to the second surface 37b of the first inclined surface 37 and the elastic member 34 is attached. It is energized by power. Therefore, the shift fork 11 is stably held at the first engagement position because the second surface 37b of the detent ball 32 is steeper than the first surface 37a. Thus, different tangent angles can be set between the detent ball 32 and the first inclined surface 37 by providing the first inclined surface 37 with the gentle slope and the steep slope by the first surface 37a and the second surface 37b. Setting of a desired pressing load on the first inclined surface 37 is facilitated.

When the shift fork 11 swings from the neutral position shown in FIG. 5 to the second engagement position where the hub 14 and the transmission gear 16 are engaged, the detent ball 32 moves to the shift fork 11. Of the engagement of the recess 36 against the pressure by the elastic member 34 and moves to the second inclined surface 38 as shown in FIG. 6B. The detent ball 32 moved to the second inclined surface 38 is pressed against the second inclined surface 38 by the biasing force of the elastic member 34. Thereby, the shift fork 11 is stably held in the second engagement position.

The second inclined surface 38 is the same as the first inclined surface 37, and as shown in FIG. 6B, the facing distance between the tip surface 31b of the cylindrical member 31 and the second inclined surface 38 as it approaches the opening of the recess 36. L2 is provided to narrow. The second inclined surface 38 has a first surface 38a connected to the opening of the recess 36 and a second surface 38b connected to the first surface 38a, and the second surface 38b is opposed to the first surface 38a. It is formed on a steep slope where the change rate of the distance L2 is large. As shown in FIG. 6B, in the second engagement position where the hub 14 and the transmission gear 16 engage, the shift fork 11 has the detent ball 32 attached to the second surface 38b of the second inclined surface 38 and the elastic member 34 attached. It is energized by power. Therefore, the shift fork 11 is stably held in the second engagement position because the second surface 38b of the detent ball 32 is steeper than the first surface 38a. Thus, different tangent angles can be set for the detent ball 32 and the second inclined surface 38 by providing the second inclined surface 38 with the gentle slope and the steep slope by the first surface 38 a and the second surface 38 b. Setting of a desired pressing load on the second inclined surface 38 is facilitated.

As described above, when the shift fork 11 is positioned at the first engagement position and the detent ball 32 is pressed against the second surface 37b of the first inclined surface 37, as shown in FIG. 6A, the tip surface 31b of the cylindrical member 31. The facing distance L1 between the first inclined surface 37 and the first inclined surface 37 is a distance at which the detent ball 32 does not separate from the cylindrical member 31. Specifically, an opposing distance L1 with respect to the longitudinal direction of the cylindrical member 31 between a position at which the detent ball 32 is pressed on the second surface 37b of the first inclined surface 37 of the shift fork 11 and the tip surface 31b of the cylindrical member 31. Is set to a length shorter than the diameter 2y of the detent ball 32.

Similarly, as shown in FIG. 6B, when the shift fork 11 is positioned at the second engagement position and the detent ball 32 is pressed against the second surface 38b of the second inclined surface 38, the tip surface 31b of the cylindrical member 31 and The facing distance L2 between the second inclined surface 38 and the second inclined surface 38 is a distance at which the detent ball 32 does not separate from the cylindrical member 31. Specifically, an opposing distance L2 with respect to the longitudinal direction of the cylindrical member 31 between a position at which the detent ball 32 is pressed on the second surface 38b of the second inclined surface 38 of the shift fork 11 and the tip surface 31b of the cylindrical member 31. Is set to a length shorter than the diameter 2y of the detent ball 32.

As described above, the shift fork 11 is in the first engagement position or the second engagement position according to the relationship of L1 and L2 <2y with the opposing distances L1 and L2 set as the diameter 2y of the detent ball 32. When the detent ball 32 presses the first inclined surface 37 or the second inclined surface 38, the detent ball 32 can be prevented from dropping out of the cylindrical member 31.

As shown in FIG. 4, the detent device 30 is provided with a shoulder 31 a on the outer periphery of the cylindrical member 31. A locking portion 17 a capable of locking the shoulder 31 a is provided on the housing 17. The locking portion 17 a is provided on the inlet side of the cylindrical member 31 in the mounting hole 33 in the housing 17. Thereby, the cylindrical member 31 can be positioned with respect to the housing 17. Therefore, between the position where the detent ball 32 is pressed on the

inclined surfaces

37 and 38 of the shift fork 11 described above required to prevent the detent ball 32 from falling off the cylindrical member 31 and the tip surface 31 b of the cylindrical member 31 The setting of the facing distances L1 and L2 with respect to the longitudinal direction of the cylindrical member 31 between them becomes easy. As a result, it is easy to prevent the detent ball 32 from falling off the cylindrical member 31. The shoulder 31 a of the cylindrical member 31 is locked to the locking portion 17 a of the housing 17 and held by the plug 40 screwed to the housing 17.

In the detent device 30, as shown in FIG. 3, the contact portion 11a provided on the shift fork 11 is provided on the rotation center shaft 18b by the biasing force of the elastic member 34 acting in the axial direction of the rotation center shaft. It abuts on the portion 18b1 and is pressed. Thereby, it is possible to reduce the play in the axial direction of the rotation center shaft 18 in the shift fork 11.

In the example of FIG. 3, the detent device 30 acts on the shift fork 11 in the axial direction of the rotation center shaft 18 and the long cylindrical member 31 extending in the axial direction of the rotation center shaft 18. The structure provided with the elastic member 34 pressed by an urging | biasing force was shown. However, instead of this, the detent device 30 extends the longitudinal cylindrical member 31 in the direction perpendicular to the axial direction of the rotation center shaft 18, and the elastic member 34 transfers the detent ball 32 to the shift fork 11. It is also possible to change so as to press by the biasing force acting in the direction perpendicular to the axial direction of the rotation center shaft 18. Thus, in the detent device 30, the shift fork 11 is stably held in the neutral position, the first engagement position, and the second engagement position, as in the configuration shown in FIG.

Although the detent device 30 is provided with two

inclined surfaces

37 and 38 provided on both sides of the recess 36 in the swing direction of the shift fork 11 as the inclined surfaces, the shift transmission gear with which the hub 14 meshes is In the case of one, it is obvious that it is sufficient to provide one accordingly.

Next, another embodiment of the detent device according to the present invention will be described based on FIG. 7, FIG. 8A and FIG. 8B. In the detent device 30A which is another embodiment of the detent device, as shown in FIG. 7, FIG. 8A, and FIG. 8B, the recess 36 and the first inclined surface 37 (including the first surface 37a and the second surface) constituting the pressure receiving portion 35. 37b) and the second inclined surface 38 (including the first surface 38a and the second surface 38b) form a curved surface forming a part of a circular arc, and the radius of curvature of the recess 36 and the first inclined surface 37 and the second inclined surface 38 is The fact that the radius of curvature y of the detent ball 32 is larger than the radius of curvature y of the detent ball 32 is different from the detent device 30 according to the above-described one embodiment, but exhibits the same function.

Since the pressure receiving portion 35 of the detent device 30A is provided in a curved surface shape forming a part of an arc, the recess 36, the first surface 37a which is a gentle slope of the first inclined surface 37, and the second surface 37b which is a steep slope, Compared with the pressure receiving portion 35 of the detent device 30 having the first surface 38a which is the gentle slope of the second inclined surface 38 and the second surface 38b which is the steep slope, the inflection point of the load can be eliminated, and it is smooth It becomes possible to operate.

Similar to the detent device 30, in the detent device 30A, the shift fork 11 is stably held at the neutral position at the deepest portion of the curved pressure receiving portion 35 forming a part of an arc as shown in FIG.

Similar to the detent device 30, as shown in FIG. 8A, the detent device 30A stably holds the shift fork 11 in the first engagement position by the curved pressure receiving portion 35 forming a part of an arc. As shown in FIG. 8A, when the shift fork 11 is positioned at the first engagement position and the detent ball 32 is pressed by the curved pressure receiving portion 35 forming a part of a circular arc, the detent ball 32 in the pressure receiving portion 35 is pressed. The facing distance L1 with respect to the longitudinal direction of the cylindrical member 31 between the position where it is made and the tip surface 31b of the cylindrical member 31 is set to a length shorter than the diameter 2y of the detent ball 32. Thus, the detent ball 32 does not separate from the cylindrical member 31 as the detent device 30 does.

Similar to the detent device 30, as shown in FIG. 8B, the detent device 30A stably holds the shift fork 11 in the second engagement position by the curved pressure receiving portion 35 forming a part of an arc. As shown in FIG. 8B, when the shift fork 11 is positioned at the second engagement position and the detent ball 32 is pressed by the curved pressure receiving portion 35 forming a part of a circular arc, the detent ball 32 in the pressure receiving portion 35 is pressed. The facing distance L2 with respect to the longitudinal direction of the cylindrical member 31 between the position where it is made and the tip surface 31b of the cylindrical member 31 is set to a length shorter than the diameter 2y of the detent ball 32. Thus, the detent ball 32 does not separate from the cylindrical member 31 as the detent device 30 does.

(Effect of the embodiment)
As described above, according to the transmission shift device 10 according to the embodiment of the present invention, the power transmission shaft 12, the housing 17 accommodating the transmission having the power transmission shaft 12, and power transmission according to the shift operation A shift shaft 13 which is displaceable along the longitudinal direction of the shaft 12, and a transmission gear 15 which is integrally rotated with the power transmission shaft 12 and shifted along the longitudinal direction of the power transmission shaft 12 and provided on the power transmission shaft 12. , A rotational center shaft 18 disposed in the housing 17 on an axis extending in a direction orthogonal to the axis of the power transmission shaft 12, and a connection provided at the tip end portion The rotation center shaft 18 comprises a portion 19, a recess 36, and

inclined surfaces

37 and 38 connected to the opening of the recess 36 and inclined with respect to the rotation center axis 18. While being supported more rotatably, it is engageable with the shift shaft 13 and swings around the rotation center axis 18 according to the displacement of the shift shaft 13, and powers the hub 14 through the connecting portion 19. Shift fork 11 for shifting the transmission shaft 12 in the longitudinal direction, an engagement member 32 provided between the housing 17 and the shift fork 11 and engaged with the recess 36 of the shift fork 11, and the engagement member 32 as a shift fork 11, the engaging member 32 is engaged with the recess 36 of the shift fork 11 at the neutral position where the hub 14 and the transmission gears 15, 16 are not engaged. The engagement member 32 is engaged at an engagement position where the biasing force presses the shift fork 11 to hold the shift fork 11 in the neutral position and the hub 14 engages with the transmission gears 15 and 16. Provided on the

inclined surfaces

37, 38 of the shift fork 11 and the

detent device

30,30A for urging the shift fork 11 is pressed by the engaging position by the urging force of the elastic member 34. As a result, in the

detent devices

30 and 30A, the neutral position and the engagement position of the shift fork 11 swinging around the rotation center axis 18 can be stably maintained. Therefore, it is possible to prevent the neutral position and the engagement position of the shift fork 11 from deviating from the neutral position and the engagement position due to, for example, vibration during traveling.

As described above, according to the transmission shift device 10 according to the embodiment of the present invention, the transmission shift device 10 further includes the longitudinal cylindrical member 31 mounted on the housing 17, and the engagement member 32. Is the detent ball 32 movably held inside the cylindrical member 31, and the shift fork 11 is engaged with the facing distances L1 and L2 between the tip surface 31b of the cylindrical member 31 and the

inclined surfaces

37 and 38. When the detent ball 32 is positioned and pressed against the

inclined surfaces

37 and 38, the distance at which the detent ball 32 does not separate from the cylindrical member 31. Thus, even if the shift fork 11 is displaced to the engagement position, the detent ball 32 can be prevented from falling off the cylindrical member 31.

As described above, according to the transmission shift device 10 according to the embodiment of the present invention, the cylindrical member 31 has the shoulder 31a provided on the outer periphery of the cylindrical member 31, and the housing 17 has the shoulder 31a. A lockable locking portion 17a is provided. Thereby, the cylindrical member 31 can be positioned with respect to the housing 17. Therefore, between the position where the detent ball 32 is pressed on the

inclined surfaces

37 and 38 of the shift fork 11 described above required to prevent the detent ball 32 from falling off the cylindrical member 31 and the tip surface 31 b of the cylindrical member 31 The setting of the facing distances L1 and L2 with respect to the longitudinal direction of the cylindrical member 31 between them becomes easy.

As described above, according to the transmission shift device 10 according to the embodiment of the present invention, the facing distances L1 and L2 between the tip surface 31b of the cylindrical member 31 and the

inclined surfaces

37 and 38 It is set to a length shorter than the diameter 2y. As a result, the shift fork 11 is inclined at the first engagement position or the second engagement position by the detent ball 32 at the first inclination due to the relationship between the diameter 2y of the detent ball 32 and the opposing distances L1 and L2 set. When the surface 37 or the second inclined surface 38 is pressed, the detent ball 32 can be prevented from dropping out of the cylindrical member 31.

As described above, according to the transmission shift device 10 according to the embodiment of the present invention, the

inclined surfaces

37 and 38 approach the opening of the recess 36 and the tip surface 31 b of the cylindrical member 31 and the

inclined surfaces

37 and 38 The inclined surfaces 37, 38 are connected to the

first surface

37a, 38a connected to the opening portion of the recess 36 and the

first surface

37a, 38a, and the shift fork 11 is provided. The second surfaces 37b and 38b have the

second surfaces

37b and 38b on which the detent ball 32 is pressed when positioned in the engagement position, and the

second surfaces

37b and 38b change in opposing distances L1 and L2 compared to the

first surfaces

37a and 38a The proportion is large. As a result, the shift fork 11 is stably held at the engaged position because the

second surfaces

37b and 38b of the detent ball 32 are steeper than the

first surfaces

37a and 38a. Thus, different tangent angles can be set between the detent ball 32 and the

inclined surfaces

37, 38 by providing the

inclined surfaces

37, 38 with the gentle slope and the steep slope by the

first surfaces

37a, 38a and the

second surfaces

37b, 38b. Setting of the desired pressing load on the

inclined surfaces

37 and 38 of the detent ball 32 is facilitated.

As described above, according to the transmission shift device 10 according to the embodiment of the present invention, the recess 36 and the

inclined surfaces

37 and 38 have a curved surface shape forming a part of a circular arc, and the recess 36 and the

inclined surfaces

37 and 38 The radius of curvature of is set larger than the radius of curvature y of the detent ball 32. Thereby, the detent device 30A can eliminate the inflection point of the load, and can operate smoothly.

inclined surfaces

37 and 38 of the shift fork 11 are along the swinging direction both sides of the shift fork 11 of the recess 36 of the shift fork 11. Provided. Thereby, even when the engagement position of the shift fork 11 is provided on both sides of the neutral position of the shift fork 11, the neutral position and the engagement position of the swinging shift fork 11 can be stably maintained.

As described above, according to the transmission shift device 10 according to the embodiment of the present invention, the detent device 30 is disposed such that the biasing force of the elastic member 34 acts in the axial direction of the rotation center shaft 18 ing. Thereby, it is possible to reduce the play in the axial direction of the rotation center shaft 18 in the shift fork 11.

It should be noted that, when there are a plurality of embodiments, it is obvious that the characteristic parts of the respective embodiments can be combined as appropriate, unless otherwise specified.

1: Transmission, 10: Shifting device for transmission, 11: Shift fork, 12: power transmission shaft, 13: shift shaft, 14: hub, 15: transmission gear, 16: transmission gear, 17: housing, 17a: engagement Stop part 18: rotation center shaft 19: connection part 30: detent device 30A: detent device 31: cylindrical member 31a: shoulder 31b: tip face: shoulder 32: detent ball (engagement Member), 34: elastic member, 36: recess, 37: first inclined surface (inclined surface), 38: second inclined surface (inclined surface).

Claims

Power transmission shaft,
A housing for accommodating a transmission having the power transmission shaft;
A shift shaft displaceable along a longitudinal direction of the power transmission shaft in response to a shift operation;
A hub which rotates integrally with the power transmission shaft and is shifted along the longitudinal direction of the power transmission shaft, and which is rotatably engageable with a transmission gear provided on the power transmission shaft;
A pivoting central axis disposed in the housing on an axis extending in a direction perpendicular to the axis of the power transmission shaft;
A connecting portion provided at the tip portion, a recess, and an inclined surface connected to the opening of the recess and inclined with respect to the rotation center axis, and supported rotatably by the rotation center axis At the same time, it is engageable with the shift shaft and swings around the rotation center axis according to the displacement of the shift shaft, and shifts the hub in the longitudinal direction of the power transmission shaft via the connection portion. With shift forks
An engagement member provided between the housing and the shift fork and engaged with the recess of the shift fork; and an elastic member pressing the engagement member toward the recess of the shift fork. In the neutral position where the hub and the transmission gear are not engaged, the engagement member is pressed against the recess of the shift fork by the biasing force of the elastic member, and the shift fork is held at the neutral position. In an engagement position where the hub engages with the transmission gear, the engagement member is pressed against the inclined surface of the shift fork by the biasing force of the elastic member to bias the shift fork to the engagement position. And a shift device for a transmission.
The transmission shift device further includes a longitudinal cylindrical member mounted on the housing, and the engagement member is a detent ball movably held inside the cylindrical member, and the cylindrical member The facing distance between the tip surface and the inclined surface is a distance that the detent ball does not disengage from the cylindrical member when the shift fork is located at the engagement position and the detent ball is pressed against the inclined surface. The transmission shift device according to claim 1.
The shift device according to claim 2, wherein the cylindrical member has a shoulder provided on an outer periphery of the cylindrical member, and the housing includes a locking portion capable of locking the shoulder.
The transmission shift device according to claim 2, wherein the facing distance is shorter than a diameter of the detent ball.
The inclined surface is provided such that the opposing distance narrows as it approaches the opening of the recess, and the inclined surface is connected to the first surface connected to the opening of the recess and to the first surface, and the shift fork is The second surface has a second surface on which the detent ball is pressed when positioned at the engagement position, and the second surface has a larger change ratio of the facing distance than the first surface. The transmission shift device according to any one of to 4.
The concave portion and the inclined surface have a curved surface shape forming a part of a circular arc, and the radius of curvature of the concave portion and the inclined surface is larger than the radius of curvature of the detent ball. Transmission shift device.
The transmission shift device according to any one of claims 1 to 6, wherein the inclined surface is provided along both sides of the recess of the shift fork in the swing direction of the shift fork.
The transmission shift device according to any one of claims 1 to 7, wherein the detent device is arranged such that the biasing force of the elastic member acts in the axial direction of the rotation center axis.